I have been there both during the summer (enjoying 5 hours long lunch with beautiful view on the surrounding vineyards) and during the winter, with almost as long diner in 300 years old cellar. One of the top restaurants on my, very long, list with the chef always working new products, new combinations and new tastes.
Pri Lojzetu is a combination of a slow food temple with some elements of molecular cuisine and amazing wine cellar with almost everything being served by glass.
Impossible to describe all dishes, seven or eight, we had: tartar of swordfish and Adriatic tuna with few magnet bay scampi, dried/marinated beef carpaccio on green peas foam, "wild bear goulash", polenta with scampi, local version of carbonara and many, many others. Be carefully, make sure that you have some room left for deserts (my mistake, we had none so end up having only his gin tonic sorbet, very impressive).
We have been there for a diner on a rainy Friday evening and the restaurant was full - by itself, it is probably a good enough proof of the quality as the place is in a middle of nowhere, really: 45-60mins drive to either of Ljubljana or Trieste, and a bit short to Goritza - unfortunately, there is no hotel nearby (or at least none you may want to stay at after such a great meal), so one needs to drive to either of those places.
Make sure you have at least 3-4 hours for your lunch or diner - anything less than that and you will miss a big part of the experience.
As to the bill: probably the best value for money I've ever seen (keep this way !) - the bill will be always less that you would imagine.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.